A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Prove that the below maths equation is true.

8 + 8 = 91

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What does the below rebus puzzle mean?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?